JPH037434Y2 - - Google Patents

Description

[Detailed explanation of the idea]

B. Purpose of the invention Industrial application field The present invention relates to a double-sided adhesive interlining. Specifically, the present invention relates to an interlining material that has double-sided adhesive properties and is useful as an interlining material for clothing, particularly so-called reversible clothing that can be worn inside out. Conventional technology and its problems Conventionally, reversible clothing has been made by interposing a double-sided adhesive interlining between front and back fabrics and adhering them using a press or the like. As this double-sided adhesive interlining, for example, there is a non-woven fabric made of heat-fusible fibers, but this has the major drawback that the texture becomes hard because the front and back fabrics are bonded to the entire surface. There is. In addition, a method has been developed that uses a dot-processed hot-melt resin on the release paper, but this method has the disadvantage that the hot-melt resin does not easily stick to the release paper, and that improving this adhesion can lead to problems with mold release. There are drawbacks. Therefore, it was considered to use a base sheet made of thin non-woven fabric or the like, with dots of hot-melt adhesive applied to both sides of the sheet.
Currently, it has not been put into practical use due to poor productivity. In other words, if dots are formed on a thin non-woven fabric or the like, there will be a lot of staining on the back-up roll, making production impossible. In addition, a net-like adhesive interlining has been proposed, but since the adhesive structure is continuous, this has a hard texture and tends to penetrate into the fabric, making it unsuitable. In order to solve the above-mentioned problems, the inventors of the present invention aimed to put into practical use a method using a thin non-woven fabric as a base sheet and a sheet having dots of hot-melt adhesive applied to both sides of the base sheet. As a result of various studies, we arrived at this invention. B. Structure of the invention The structure of the invention is a sheet in which a hot melt adhesive is applied in dots to form a large number of dots on the upper and lower surfaces of the sheet through a base sheet, and each of the dots is formed on the sheet. 40 correspondingly on both sides
% or more, and has the same melting point even if the hot melt adhesives applied to the upper and lower surfaces are made of the same resin or are of different types. interlining,
The main points are as follows. Measures to solve the problem We used a thin non-woven fabric as a base sheet and formed a large number of dots on both sides of the sheet using hot melt adhesive. It was difficult to find something that satisfied my needs, so after further investigation, I learned that if I applied the dots on the top and bottom surfaces as much as possible, overlapping them, I could get a good texture and excellent adhesion, so I decided to do something like this. In particular, they have found that excellent effects can be obtained, such as solving the problem of stains on the back-up rolls and making it possible to put it into practical use in mass production. FIG. 1 is an enlarged partial cross-sectional view of the interlining of the present invention, where a shows a case where the upper and lower overlaps match, and b shows a case where the upper and lower overlaps are misaligned. FIG. 2 is a perspective view of the interlining of the present invention. As shown in these figures, the present invention is a sheet-like material in which a large number of dots 2, 2' are formed with a hot melt adhesive on the upper and lower surfaces, that is, both surfaces, of a base sheet 1. The dots 2 on the upper surface and 2' on the lower surface correspond to each other and have an overlapping area of 40% or more. In the case of Fig. 1 a, the most ideal dots 2, 2'
is formed, and the overlap is almost 100%. Although it is somewhat difficult in production to create complete overlap in this way, it is comparatively possible to produce the dots so that the lower dots 2' may be slightly misaligned with respect to the upper dots 2 as shown in Figure 1b. This makes it easier to target. However, as this gap becomes larger, the overlapping area increases.
If it is less than 40%, the purpose of the present invention cannot be achieved. In other words, as the texture becomes harder, the adhesiveness also decreases. In Figure 1, the dots 2 and 2' made of hot melt adhesive are depicted as being formed by slightly impregnating the base sheet 1, but the top and bottom may be separated like this, or the top and bottom may be separated. The dots 2 and 2' may be joined together within the layer of the base sheet 1 to form a continuous state. Examples of hot melt adhesives forming the dots 2 and 2' include polyamide, polyester, polyolefin, ethylene vinyl acetate, acrylic, polyurethane, vinyl chloride, and saponified polyvinyl acetate. Examples include thermoplastic resins. Furthermore, in the present invention, the same adhesive may be used for the upper and lower parts, or different adhesives may be used for the upper and lower parts depending on the purpose, but it is required that their melting points be the same. As shown in the examples described later, dots 2, 2' applied to the upper and lower surfaces of the base sheet 1
If the hot melt adhesives are made of the same resin, their melting points will naturally be the same. Therefore, when this is used as a double-sided adhesive interlining, the dots 2 and 2' on both sides will melt at the same time due to heat treatment, and either one will melt at the same time. However, no adhesion failure occurs. In other words, if there is a difference in melting point between dot 2 and dot 2', the side with a higher melting point will always have poor adhesion, but in this invention, in order to prevent this defective adhesion, adhesive with the same melting point is applied to both sides. It is used. In other words, the condition is to use adhesives made of the same resin, or to select adhesives with the same melting point when using different types of adhesives on both sides in consideration of their adhesion to fabrics on both sides. . In particular, when the upper and lower adhesives are different types, for example, if the outer fabric of the garment is polyester fiber and the lining fabric is polyamide fiber, the upper dot 2 is made of polyester resin and the lower dot 2' is made of polyamide resin. If you use an adhesive that has the same or similar SP value as the resin, the adhesive strength will be higher and the amount of each adhesive can be reduced, resulting in a softer texture. However, if the melting point of both adhesives is It is necessary to match the degree of polymerization (molecular weight), etc. The amount of dot-applied hot melt adhesive on both sides is 8 to 40g/ ^m2 , which is good.If it is less than 8g/ ^m2 , the adhesive strength will decrease, and if it exceeds ^40g /m2, the texture will be poor. becomes hard. A particularly preferred range is 15 to 25 g/ ^m2 . In addition, in Fig. 1, the upper surface dot 2 and the lower surface dot 2'
Although the sizes of the two are shown to be approximately equal, they do not necessarily have to be the same, and as long as the difference between the two is not greater than 10:1, it is acceptable, and within this range. It is a good idea to design it according to the purpose. The size and number of these dots 2 and 2' are common sense, and their diameter is 0.3 to 4.
mm is preferably 0.6 to 2.5 mm, the number is preferably 5 to 170 dots/cm ² , and the density of the dots 2 and 2' is preferably 3 to 35% of the total area. As the base sheet 1 in the present invention, non-woven fabric, woven fabric, knitted fabric, etc. can be used, but the basis weight is 70
Favorable results can be obtained by using a thin base sheet 1 of g/m ² or less. If the base sheet 1 is thick and has a basis weight of more than 70 g/ ^m2 , many of the adhesive dots will be impregnated into the sheet, making it difficult to obtain adhesive strength.Moreover, a thick interlining will be inserted inside, resulting in poor texture. The disadvantage is that it becomes a stiff material. Function The present invention has the above-mentioned configuration, and when the front and back sides of clothing materials are bonded together using this double-sided adhesive interlining, the dots 2 and 2 on both sides are created by heating and pressure during bonding.
2' are pushed in opposite directions, and the upper and lower dots 2 and 2' melt into each other, increasing the adhesive strength between the front and back sides due to the anchor effect, and reducing the amount of adhesive wasted, resulting in a strong adhesive effect. It is. If there is a large misalignment between the upper and lower dots 2 and 2', a large amount of adhesive will impregnate the base sheet 1 during this contact pressure and come out to the opposite side, resulting in a significant decrease in the adhesive strength as a whole. With the devised interlining, the overlap between the top and bottom is over 40%, so the adhesion at each point is sure to demonstrate its ability. Furthermore, in the interlining of this invention, there are two dots above and below the interlining.
Because the 2′ overlap, the bonding points on the front and back sides are the same, and strong bonding is achieved with a small overall bonding area, resulting in a fabric that has a soft texture and is extremely comfortable to wear. . Furthermore, since the interlining of the present invention has upper and lower dots 2 and 2' overlapping, its productivity is good and it can be put to practical use. In other words, by using the roll processing method, two rolls are synchronized and the resin is applied to the same area on both sides at the same time, so there is no resin adhesion to the back-up roll.
Double-sided dot processing can be achieved without any problems. Example: The basis weight of the nonwoven fabric was changed in five ways as shown below, and polyamide resin was applied in dots on both sides of each nonwoven fabric so that the dot size was 0.8 to 1.2 mm in diameter, with a total coating amount of 17 g/ ^m2. did. In addition, this vertical overlapping area is also 3 as shown in Table 1.
Created as per. Test symbol Nonwoven fabric weight (1 ^m2 ) A...10g B...20g C...30g D...50g E...100g Tropical fabrics were made using these adhesive interlinings using a Reliant press machine MARK- manufactured by Asahi Textile Machinery Co., Ltd.
7B, both sides were adhered by heating and pressing at 2 kg/cm ² at 136° C. for 15 seconds. The adhesive strength of the product thus obtained was measured. The results are shown in Table 1.

[Table] From this table, it can be seen that a strong adhesive force is obtained when the overlapping area is large, and that the adhesive force improves as the basis weight of the nonwoven fabric decreases. Next, the texture after adhesive finishing was measured and compared. The results are shown in Table 2. Note that this texture is expressed by the total value of the bending rigidity in the vertical and horizontal directions using a pure bending tester KES-FB2 manufactured by Kato Iron Works Co., Ltd., and the lower the value, the more flexible it is.

[Table] From this table, it can be determined that the larger the overlap area, the better the texture, and the smaller the basis weight of the nonwoven fabric, the softer the texture. In addition, when we conducted the same experiment as above using woven fabric or tricot as a base sheet, we found that although the adhesive strength was slightly lower than in the case of non-woven fabric, the larger the overlap area, the better the adhesive strength and flexibility. Admitted. Particularly excellent results were obtained in terms of flexibility when using tricots as the base material. It has also been found that the basis weight of the base sheet needs to be 70 g/m ² or less even in these tricots and woven fabrics. C. Effects of the invention As explained in detail above, the invention is based on the invention, in which a large number of dots are applied on both sides of a base sheet with hot melt adhesive in a dot pattern such that the upper and lower sides have an overlapping area of 40% or more. It is an adhesive interlining, and its effect is that it has excellent adhesive strength and maintains good flexibility and texture of clothing after adhesion.
It exhibits excellent utility as a double-sided adhesive interlining for reversible clothing. Furthermore, the interlining of the present invention is excellent in its productivity and does not adhere to back-up rolls unlike conventional interlinings, so it can actually be mass-produced and has great practical effects.

[Brief explanation of drawings]

FIG. 1 is an enlarged partial cross-sectional view of the interlining of the present invention, where a shows a case where the upper and lower overlaps match, and b shows a case where the upper and lower overlaps are misaligned. FIG. 2 is a perspective view of the interlining of the present invention. 1... Base sheet, 2, 2'... Dots.

Claims (1)

[Claims for Utility Model Registration] 1. A sheet in which a hot melt adhesive is applied in dots to form a large number of dots on the upper and lower surfaces of a base sheet, wherein each of the dots forms a plurality of dots on both sides of the sheet. have an overlapping area of 40% or more corresponding to the above, and have the same melting point even if the hot melt adhesives applied to the top and bottom surfaces are made of the same resin or are of different types. A double-sided adhesive interlining featuring 2 The dot application amount of hot melt adhesive is 8 to 40
g/m ² double-sided adhesive interlining according to claim 1 of the utility model registration claim. 3. The double-sided adhesive interlining according to claim 1, wherein the base sheet has a basis weight of 70 g/m ² or less.